yes im sure its not a spam issue.
my ip by default listed in spamhaus and other lists
(if spam i get back message saying that email was rejected by remote server)
need send my mail to my isp smtp server, which i set in kloxo already
in smtp relay " :smtp.isp.net " ,,an can telnet to isp smtp server too on port 25
if i remove smtp relay info, and try to send message, i should get spam error
but message is same: cannot establish smtp connection